8.6″ AXLE ASSY ’02-’05 GM ENVOY & TRAILBLAZER 3.73 POSI Rear Differential Assembly

Trailblazer 8.6″ Rear Axle Zumbrota Drivetrain has proudly served a nationwide customer base for over three decades. We offer a comprehensive range of new, remanufactured, OE replacement, and performance manual transmissions, transfer cases, and differentials, along with premium components for rebuilding and repair. Our inventory supports a variety of foreign and domestic passenger cars, SUVs, and light-duty trucks.

Rear Differentials: Trailblazer 8.6″ Rear Axle

Many companies claim to offer rear differentials, but what sets us apart is our commitment to quality remanufacturing. With nearly 30 years of expertise, we understand the intricate process of providing a superior remanufactured rear differential assembly. We avoid cutting corners and marketing gimmicks—our product lineup speaks for itself, catering to everything from passenger vehicles to OHVs, race cars, and pulling trucks.

Features: Trailblazer 8.6″ Rear Axle

Our manufacturing process ensures the highest quality standards, with features that include:

Precision Inspection and Testing

• All tubes are meticulously inspected and straightened to OEM specifications.
• Housings are rigorously tested for surface wear and cracks.
• 100% inspection of all internal components, including:
  • Ring and Pinions
  • Internal Gears
  • Clutches
  • Carriers

Component Replacement and Cleaning

• 100% replacement of critical components such as:
  • Bearings
  • Seals
  • Crush Sleeves
  • Pinion Nuts
  • Shims
• A state-of-the-art hydroblasting and rinsing process restores all housings to OEM finish.

Optimized Performance and Longevity

• Gear patterns are carefully checked during the remanufacturing process to ensure optimal tooth contact for enhanced durability.
• Precision setup using inch-pound measurements ensures correct rolling torque for longevity.
• Backlash clearance is meticulously set to guarantee proper gear lubrication and noise reduction.

Note: A refundable core charge applies to all purchases.

Product Details: Trailblazer 8.6″ Rear Axle

• Engine: 5.3L
• Ratio: 3.73
• Type: Rear Differential
• Ring Gear Size: 8.5 Inch
• Model: GM 8.5
• Ratio Option: GT4
• Wheelbase: 129 Inches
• Capacity: 7-Passenger
• Feature: With Posi-Traction

Compatible Vehicles

• 2003-2006 Chevrolet TrailBlazer XL GM 8.5
• 2003-2006 GMC Envoy XL GM 8.5